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CBSE Class 9 Answered

what is persistence of hearing
Asked by | 26 Feb, 2013, 08:34: PM
answered-by-expert Expert Answer
The sensation of hearing of any sound persists in our brain for 0.1s.This is called the persistence of hearing.
Answered by | 27 Feb, 2013, 12:56: PM

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CBSE 9 - Physics
(3 X 3 = 9) CASE STUDY QUESTION 26. Ultrasounds can be used to detect cracks and flaws in metal blocks. Metallic components that are generally used in construction of big structures like buildings, machines and also scientific equipment. The cracks or holes inside metal blocks, which are invisible from outside, reduce the strength of the structure. Ultrasonic waves are allowed to pass through the metal block and detectors are used to detect the transmitted waves. If there is even a small defect, the ultrasound gets reflected back indicating the presence of flaw or defect. Clearly indicated in the figure Defect or flaw Ultrasound Detectors Metal Block (a) The transmitter sends an ultrasound wave of speed 5960m/s through a long steel bridge and a block reflects it back after 0.02s. how far the block in the metal bridge is from the transmitter. (b) With the above property of ultrasound waves, Can ultrasonic waves be used in the medical field? If so, how and give one use in the medical field to justify your answer? (c) Give two practical applications of reflection of sound waves?
Asked by mailtoparvathyprajith | 31 Jan, 2024, 06:55: PM
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CBSE 9 - Physics
What is the SI Unit of "Intensity of Sound"?
Asked by manaskumarbiswasbrb | 04 Feb, 2023, 08:35: PM
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CBSE 9 - Physics
explain human ear with lable diagram
Asked by sm6878261 | 12 Jan, 2023, 07:42: AM
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CBSE 9 - Physics
MCQ on reflection of light and sound chapter  
Asked by pooja12366764 | 25 Jan, 2022, 10:46: PM
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CBSE 9 - Physics
propagation of sound
Asked by ashishyadav | 22 Mar, 2021, 05:20: AM
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CBSE 9 - Physics
What is sound   
Asked by Alamglassfebricartion | 16 Mar, 2021, 09:57: AM
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CBSE 9 - Physics
A stone
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Asked by satyamthakur7570 | 21 Dec, 2020, 09:04: PM
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CBSE 9 - Physics
what is reverabation
Asked by mursaleenmalik1962 | 14 Dec, 2020, 07:18: PM
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CBSE 9 - Physics
Can blackbox pings signal travel 3000kms? Can it be reflected on metal surface?
Asked by dwarakanathan.s | 19 Apr, 2020, 07:02: AM
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CBSE 9 - Physics
what is tuning fork 
Asked by upmasoodpassi | 05 Apr, 2020, 11:09: AM
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